$\"\"$

The dot product of $\"\"$ and $\"\"$ is $\"\"$ .

The vectors $\"\"$ and $\"\"$ are orthogonal if and only if $\"\"$ .

$\"\"$

The vectors are $\"\"$ and $\"\"$ .

Write the vectors in component form.

Thus, the vectors are $\"\"$ and $\"\"$ .

$\"\"$

Since $\"\"$ , the vectors $\"\"$ and $\"\"$ are not orthogonal. $\"\"$

$\"\"$ ; not orthogonal.